A couple years ago (about 2002) we followed it, by car, from Plymouth to Woodsville. What parts of it are not the actual highway you're on, were, if I recall right, completely (or nearly so) intact. We even drove on part of it, directly adjacent to some river, not too far west of Rumney if memory serves me well. It was a dirt road, suitable for autos. We found it, because the name of the street was "Old Railroad Line Avenue" or something like that. It's just off of Rte. 25.
From Plymouth to Rumney it's real easy to spot, as it has power lines on it.
Some parts of it elsewhere appear to be quite well maintained as snomobile and hiking trails, too. Other parts are just forgotten paths through the woods, although they ARE "locatable" and "intact", and might be suitable for biking or hiking.
We had the "New Hampshire Atlas and Gazetteer", by DeLorme Maps, to guide us. It was an older edition (1980s) that showed (in dotted lines) the ROW and even the location of former depots. Updated versions of the Gazetteer, to my knowledge, tend to omit abandoned ROWs, but don't quote me on this.
In Warren, NH, there is a nice little historical marker thing in the center of town with some photos and comments on the RR through town, and its demise.
One of the neatest things, chasing the ROW, was that in Warren, we came across the "Warren Rocket", a spaceship (actually a missile) right in the town center! (And right where the railroad ROW is). A spaceship was just about the LAST thing anyone would expect to see in a New Hampshire town.
http://hikethewhites.com/photos/warren.jpg
In the photo, there is a road in the foreground, then a brown line (a dirt path) going right across the middle of the foreground, then the buildings and the rocket in the background. The "brown line/dirt path" is probably the ROW, and I'm 99% sure that it is, but I simply do not recall if it was in this spot, or on the far side of the buildings and the rocket. Maybe someone more familiar with Warren NH can confirm. Anyway it cuts right through town and is a well-maintained dirt road in this particular area.
In most of the towns through which it goes, you can clearly see where it comes out of the woods into town, and then tucks back into the woods. I think the only place we had trouble spotting it was in Wentworth NH. Basically, we had no trouble following it and finding it except for Wentworth and (maybe) a couple other spots.
There were no rails left on any portion that I recall, and it looks like they had just recently ripped the rails out at Woodsville. It looked like until fairly recently, there had been a yard and roundhouse at Woodsville that
may have survived right into the 1990s. Anyone able to confirm this?
-John K.